In fact you can. It is pretty easy to increase the multiplier; just raise import tariffs by enough so that the marginal propensity to import out of income is reduced substantially. Yes, yes, import protection is inefficient and not a very neighborly thing to do–but should we really care if the alternative is significantly lower growth and higher unemployment? More to the point, will Obama and his advisers care?

Being the open economy that it is, I fear that the U.S. will have to confront this dilemma sooner or later. In an environment where the dollar has already appreciated against the Euro and even more significantly against emerging market currencies, fiscal stimulus here will produce an even larger current account deficit. If American consumers decide to spend 40 cents of a dollar of additional income on cheap imports from China and other foreign countries, the multiplier will be a mere 1.3. How long will it take before politicians of all stripes cry foul over the leakage through the trade account and the „gift to foreigners“ that this represents? And they will have Keynesian logic on their side.

The way out of this dilemma is to get the rest of the world to engage in fiscal expansion at the same time–so that the gift is returned. The good news here is that China is playing along and hopefully the Europeans will too (if they can convince Germans to get over their weird obsession with fiscal conservatism).